1-26 arithmetic 算术

1-22 numbers 数字

1 Roman numberals 罗马数字

2 Arabic numberals阿拉伯数字

3 abstract number, a four-figure number [units; tens; hundreds; thousands]不名数[无标明单位]；四位数[个位；十位；百位；千位]

4 concrete number 名数[有标明单位]

5 cardinal number (cardinal) 基数

6 ordinal number (ordinal) 序数

7 positive number [with plus sign] 正数（以加号表示）

8 negative number [with minus sign] （以减号表示）

9 algebraic symbols 代数符号

10 mixed number [whole number (integer); fraction] 带分数（整数；分数）

11 even number 偶数

12 odd number 奇数

13 prime number 素数

14 complex number [real part; imaginary part] 复数[实部；虚部]

15-16 vulgar fractions 普通分数

15 proper fraction [numerator; horizontal line; denominator] 真分数[分子；横线；分母]

16 improper fraction, also the reciprocal of item 15 假分数，即15项的倒数

17 compound fraction (complex fraction) 繁分数

18 improper fraction [when cancelled down produces a whole number] 可约分数 [相约时得整数]

19 fractions of different denominations [common denominator] 不同分母的分数[公分母]

20 proper decimal places [tenths; hundredths; thousandths] 真小数位[十分位；百分位；千分位]

21 recurring decimal 循环小数

22 recurring decimal 循环小数

23-26 fundamental arithmetic operation 基本算术运算

23 addition (adding) [3 and 2: the terms of the sum; +: plus sign; =: equals sign; 5: the sum] 加法[3与2：相加数；+：加号；=：等号；5：和]

24 subtraction (subtracting) [3: the minuend;  -: minus sign; 2: the subtrahend; 1: the remainder (difference)] 减法[3：被减数；-：减号；2：减数；1：余（差）]

25 multiplication (multiplying) [3: the multiplicand; x(in German): multiplication sign; the multiplier: 2 and 3; factor:6: the product] 乘法[3:被乘数；X（的文为· ）：乘号；2：乘数；2与3：乘数；6：积]

26 division (dividing) [6: the dividend;  ÷(in German:): division sign; 2: the divisor; 3: the guotient] 除法[6：被除数；÷(德文为:)：除号；2：除数；3：商]